Species Guide
ðĶDucks Health Conditions
Pekin, Muscovy, Khaki Campbell, and more
Ducks are hardier than chickens in many respects but have distinct health vulnerabilities - particularly respiratory infections, niacin deficiency, and conditions related to their water habitat. They also handle some medications differently, making species-specific guidance important.
17 vet-reviewed conditions documented for ducks.
Botulism in Chickens (Limberneck)
Botulism in chickens is caused by Clostridium botulinum toxin ingested from rotting organic matter, dead animals, or spoiled feed. It causes progressive flaccid paralysis starting in the legs and working up to the neck, causing the characteristic 'limberneck' posture. It is often fatal but can be treated with antitoxin and supportive care if caught early.
Egg Binding
Egg binding in chickens occurs when a hen cannot pass an egg through the oviduct, often because of calcium deficiency, obesity, dehydration, an oversized egg, or weak muscle contractions. Affected hens strain, become lethargic, and may stand upright with a swollen abdomen. Warmth, humidity, and lubrication can help initially, but failure to pass the egg within a few hours requires emergency veterinary care.
Newcastle Disease in Chickens
Newcastle Disease (ND) is a highly contagious viral infection of poultry caused by Newcastle Disease Virus (NDV), a paramyxovirus with strains ranging from mild to rapidly fatal. Virulent strains (Velogenic NDV) are federally reportable in the United States and can kill an entire flock within days. Clinical signs include respiratory distress, neurological deficits, greenish diarrhea, and a sudden collapse in egg production. There is no cure; outbreak management relies on vaccination, biosecurity, and regulatory response.
Polymelia (Extra Limbs)
Polymelia in chickens is a rare congenital defect in which a chick develops one or more extra limbs during embryonic growth. The additional limb may be harmless or may impair walking, develop sores, or attract flock pecking. Management is based on quality of life, with veterinary surgical removal considered when the limb causes injury or disability.
Prolapsed Vent (Blowout)
Vent prolapse in chickens occurs when cloacal tissue protrudes through the vent after excessive straining, often during egg laying. It appears as a swollen red or pink mass and can rapidly worsen through drying, trauma, or flock pecking. Immediate isolation, gentle cleaning, swelling reduction, and careful replacement are needed, with veterinary help if the tissue cannot be reduced.
Bumblefoot (Plantar Pododermatitis)
Bumblefoot in chickens is bacterial pododermatitis, usually caused when Staphylococcus aureus enters a cut or pressure injury in the footpad. Typical signs are footpad redness, swelling, limping, and a dark central scab. Mild cases need cleaning, topical antiseptic, and bandaging, while deep abscesses require veterinary debridement and sometimes systemic antibiotics.
Chicken Eye Infection (Conjunctivitis)
Eye infections in chickens range from bacterial conjunctivitis to viral disease and Mycoplasma. They present as swollen, watery, or crusty eyes and require prompt treatment to prevent blindness. The most common cause in backyard flocks is Mycoplasma gallisepticum, often triggered by respiratory illness.
Heat Stress
Heat stress in chickens is dangerous overheating caused when environmental heat and humidity exceed a bird's ability to cool itself by panting. Signs progress from open-beak panting and lifted wings to lethargy, collapse, seizures, and death. Emergency treatment is immediate shade, airflow, cool water, and electrolytes, followed by veterinary care if the bird does not respond quickly.
Impacted Crop
Crop impaction in chickens is a blockage of compacted feed, grass, string, or other fibrous material that prevents the crop from emptying. The crop remains enlarged and firm after an overnight fast, and the bird may lose appetite, weight, and energy. Early care uses hydration and gentle massage, while persistent obstruction requires veterinary removal.
Northern Fowl Mites
Northern fowl mites in chickens are blood-feeding Ornithonyssus sylviarum parasites that live continuously on the bird, especially around the vent. They cause irritation, dark feather debris, anemia, pale combs, reduced laying, and weakness. Control requires treating every bird with an approved poultry product and repeating treatment after newly hatched mites emerge.
Pasty Butt in Chicks
Pasty butt (pasting up) is a condition in which soft droppings accumulate and harden over the vent of a young chick, blocking excretion. Left untreated, it is fatal within 24-48 hours. It is most common in chicks 1-7 days old and is triggered by temperature stress, shipping stress, or improper diet.
Poultry Mites
Poultry mites are blood-feeding external parasites, including northern fowl mites that remain on birds and red mites that hide in the coop by day. They cause irritation, dark debris near the vent, pale combs, anemia, reduced production, and weakness. Effective treatment targets every bird and the environment at the same time, then repeats on the product schedule.
Poultry Red Mite
Red mites in chickens are nocturnal blood-feeding parasites that hide in coop cracks and roost fittings during daylight. Infestations cause nighttime restlessness, anemia, pale combs, reduced production, and dark or red smears on nighttime inspections. Elimination requires simultaneous treatment of birds and the entire coop, repeated to break the mite life cycle.
Broody Hen
Broodiness is a normal hormonal state in which a hen stops laying and sits persistently on a nest to incubate eggs. It is triggered by prolactin and shortened daylength, and is not a disease. Management ranges from breaking the broody cycle to allowing her to hatch eggs.
Chicken Lice
Chicken lice are host-specific chewing insects that live on poultry and feed on feathers, skin scales, and debris. Infested birds scratch, lose feather quality, and carry fast-moving tan insects or pale egg clusters near feather bases. Treatment requires an approved poultry insecticide on every bird, repeated after eggs hatch, along with cleaning of nest and dust-bath areas.
Internal Parasites (Worms)
Worms in chickens are internal helminth parasites acquired from contaminated ground or intermediate hosts such as insects, earthworms, and slugs. Heavy burdens can cause weight loss, diarrhea, pale combs, reduced laying, visible worms, or respiratory gaping. Fecal testing identifies the parasite, and treatment uses a veterinary-selected dewormer with flock-wide environmental control.
Molting (Feather Loss)
Molting in chickens is the normal replacement of old feathers with new plumage, usually triggered by shorter daylight in late summer or fall. Birds lose feathers in a recognizable pattern, stop or reduce laying, and need extra dietary protein while feathers regrow. It requires supportive nutrition and low stress, not medical treatment, unless feather loss is caused by parasites or disease.